Goldman Sachs, J.P. Morgan, Sandler O'Neill Are Leading Underwriters

Virtu Financial Inc., one of the largest high-frequency trading firms, is seeking to raise $100 million in a public offering of its stock, according to a securities filing.

Virtu is a major player in some 200 global markets, trading in stocks, currencies, futures and others assets. It is majority-owned by Vincent Viola, a former chairman of the New York Mercantile Exchange and owner of the Florida Panthers professional hockey...